[Inhibitory effect of silencing hTERT gene on growth of human squamous cell carcinoma xenograft in nude mice].

Objective: This study is to explore the inhibitory effect of silencing hTERT gene by short-hairpin RNA on growth of nasopharyngeal carcinoma xenograft in nude mice with RNAi technique.

Method: Construction and expression of hTERT cDNA sequence according to the specific hTERT mRNA, including fluorescein eukaryotic expression vector, packaged into a lentivirus. qPCR and Western blot analyzed hTER.T mRNA and protein levels in transfected cells. Proliferation rate of transfected cells was determined by MTT assay in vitro. Cell growth cycle was detected by flow cytometry. The invasiveness of each group was compared using in vitro cell invasion assay.

Result: RT-PCR and Western blot analysis showed that, hTERT siRNA significantly reduced hTERT mRNA and protein levels, especially hTERT siRNA1. siRNA treatment inhibited tumor cell proliferation, and cell migration and invasiveness were significantly lower. Tumor cell growth rate was significantly different between control group and siRNA group (P < 0.01) while tumor cell growth rate in empty virus group(NC group) and control group was not significantly different (P > 0.05).

Conclusion: Lentivirus containing specific sequences of hTERT gene could significantly inhibit the growth of nasopharyngeal carcinoma cells line. hTERT siRNA expression vector can effectively inhibit NPC cell proliferation, migration and invasion, which may provide a novel molecular targets for gene therapy of nasopharyngeal carcinoma.